Fuel cell

Abstract

A power generation unit of a fuel cell includes a first metal separator, a first membrane electrode assembly, a second metal separator, a second membrane electrode assembly, and a third metal separator. The first metal separator includes first ridges for positioning the first membrane electrode assembly. The second metal separator includes second ridges for limiting movement of the first membrane electrode assembly.

What is claimed is: 
     
         1 . A fuel cell formed by stacking an electrolyte electrode assembly between a first separator and a second separator, the electrolyte electrode assembly including a pair of electrodes and an electrolyte interposed between the electrodes,
 wherein the first separator includes a first ridge protruding toward the second separator, for positioning the electrolyte electrode assembly; and   the second separator includes a second ridge protruding toward the first separator, for limiting movement of the electrolyte electrode assembly.   
     
     
         2 . The fuel cell according to  claim 1 , wherein the second ridge is provided on an inside of the first ridge. 
     
     
         3 . The fuel cell according to  claim 1 , wherein the first ridge and the second ridge are provided adjacent to each other along an outer shape of the electrolyte electrode assembly. 
     
     
         4 . The fuel cell according to  claim 1 , wherein the first ridge has a right triangular shape in cross section, including a thin front end oriented toward the second separator and a vertical inner surface.